Eun-Hee (Kim Seo-Hyung) kehilangan ingatan akan hari-hari dimana ia adalah seorang siswi SMA. Dia mulai bekerja sebagai wakil kepala sekolah untuk SMA tempat ia lulus. Sejak mulai bekerja di sana, muncul pengelihatan aneh & halusinasi suara-suara. Ha-Young (Kim Hyun-Soo) siswi yang kerap ditindas di sekolah dan dipaksa menjadi pembuat onar. Suatu hari, Ha-Young kebetulan pergi ke kamar mandi tertutup di sekolah dan dia mendengar suara mengerikan. Di sana dia bertemu Eun-Hee. Eun-Hee dan Ha-Young menyadari kejadian aneh di sekolah terkait dengan kamar mandi yang tertutup.
Eun-Hee (Kim Seo-Hyung) has lost her memories of her high school students days. She begins to work as the vice-principal for the high school where she graduated from. Since she began to work there, she experiences unknown phantasms and auditory hallucinations. Meanwhile, Ha-Young (Kim Hyun-Soo) is a victim of school bullying. But she is driven into a trouble maker at the school. One day, Ha-Young happens to go to a closed bathroom at the school and she hears a ghost’s sound. There she faces Eun-Hee. Eun-Hee and Ha-Young are aware the weird happenings at the school is related to the closed bathroom.